A few things you should know about AirTran. I personally like them. Remember coach is pretty much the same on any airline.
How can I reserve my seat before the flight?
Customers traveling in Business Class or on full coach fares (Y or B class) may request a seat assignment at the time of booking. (The reservation agent can advise you of the fare class you have secured.) When booking these fares online, look for the "Reserve Seats" button on the Receipt page at the completion of booking. Seats on more deeply discounted fares, such as "Q","L" and "H," are assigned upon check-in for your flight.
If you have to have assigned seats months in advance AirTran is not the airline for you. Arriving early doesn't guarantee a family of 5 to be seated together because elites and full fare patrons will be accomodated before you. A small child will not be separated from an adult but there may only be one adult with a child. For example Adult A may be seated with Child B in Row 10 and Adult C and Child D may be seated together in Row 26. If this isn't acceptable book with another carrier.
Do you have first class?
Ours is a Business Class any business can afford. You'll get 7 inches more legroom than you would in coach, and a much wider seat too, since our Business Class seating is 2-across, like first class on other airlines. This means plenty of room to open your briefcase and spread out, or to work on your laptop without sharing the information on the screen with the person next to you. In addition to soft drinks and snacks, you receive two complimentary alcoholic beverages.
Business Class upgrades are available in advance for $35.00 over the full one-way coach fare for nonstop flights and for $70.00 over the full one-way fare for connecting flights. They are not available for use with discounted fares.
Currently, as a special promotion, for the amounts listed above, you may upgrade from any fare class on a first come, first served basis, upon checking in for travel.
I have flown FC on AirTran and don't find it that great of FC product. For a 2.5 hour flight I would suck it up in coach. To upgrade a family of four one way would be $140 which IMHO is not worth it. All you really get is a bigger seat. I could think of a lot of other ways to spend $140 in WDW.